Deploy war-for-test artifacts for cores 2.64 through 2.79

Details

Description

See JENKINS-45245 for context - we need to revert JENKINS-24064 due to it utterly hosing running tests in Intellij, which means we need war-for-test artifacts again. Which in turn means that we need to manually deploy war-for-test artifacts for the core versions that haven't been deploying them, currently 2.64 to 2.79 (though that could increase depending on when https://github.com/jenkinsci/jenkins/pull/3029 is merged), so that the reverted-to-original-behavior plugin-pom, maven-hpi-plugin, and jenkins-test-harness will work properly with those core versions.

This should be fairly trivial - the war-for-test jar files are literally just the original war files but with jar extension and war-for-test classifier. This could be done either via judicious use of mvn dependency:copy + mvn deploy:deploy-file calls, or via the Artifactory UI if preferred.